Abstract:Rapid data processing is crucial for distributed optical fiber vibration sensing systems based on a phase-sensitive optical time domain reflectometer (Φ-OTDR) due to the huge amount of continuously refreshed sensing data. The vibration sensing principle is analyzed to study the data flow of Rayleigh backscattered light among the different processing units. A field-programmable gate array (FPGA) is first chosen to synchronously implement pulse modulation, data acquisition and transmission in parallel. Due to th… Show more
“…For each path, differential amplitude algorithm (DAA) and standard variance algorithm (SVA) are both employed to process the collected backward-scattered Rayleigh lights. It should be mentioned that the DAA-based accumulated differential signals or SVA-based variance signals are inadequate to correctly position the external vibrations [21][22][23]. In the dualchannel system, the probability of signal fading occurred simultaneously at the same location in both channels may be extremely small, by which we could be able to decrease the possibility of missing detection.…”
“…For each path, differential amplitude algorithm (DAA) and standard variance algorithm (SVA) are both employed to process the collected backward-scattered Rayleigh lights. It should be mentioned that the DAA-based accumulated differential signals or SVA-based variance signals are inadequate to correctly position the external vibrations [21][22][23]. In the dualchannel system, the probability of signal fading occurred simultaneously at the same location in both channels may be extremely small, by which we could be able to decrease the possibility of missing detection.…”
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